Iowa offers a highly favorable assessment system for homeowners, taxing less than half of a home’s actual market value. The statewide effective property tax rate stands at 1.33%. Following the massive HF 718 property tax overhaul, local levies are being consolidated, and new massive exemptions for seniors aged 65 and older have taken effect (est., Tax Foundation 2026 / U.S. Census ACS 2023).
Property taxes in Iowa are designed to insulate homeowners from rapid housing market spikes. While local cities and school districts set the mill rates, the State of Iowa controls exactly how much of a home’s value can actually be taxed, capping statewide residential value growth at a strict 3% per year.
The “Rollback” Assessment Ratio
Every odd-numbered year, Iowa county assessors reappraise all property to 100% of its market value. However, you are not taxed on 100% of your home’s value.
To prevent tax spikes, the state applies a Residential Assessment Limitation (commonly called the Rollback Rate). By law, the total statewide taxable value of all residential property cannot grow by more than 3% in a single year. To enforce this, the state adjusts the rollback percentage.
For the 2023 and 2024 assessment years, the residential rollback rate is 46.3428%. This means if you own a $300,000 home, your Taxable Value is only $139,028. Your local mill levies are applied strictly to that reduced figure.
Iowa statewide effective rate. On a $350,000 home, expect approximately $4,655 per year at the statewide average. (est., Tax Foundation 2026).
| Home Value | Annual Tax (est.) | Monthly Payment | vs. U.S. Average |
|---|---|---|---|
| $200,000 | $2,660 | $221 | +$860 above avg. |
| $350,000 | $4,655 | $387 | +$1,505 above avg. |
| $500,000 | $6,650 | $554 | +$2,150 above avg. |
| $750,000 | $9,975 | $831 | +$3,225 above avg. |
| $1,000,000 | $13,300 | $1,108 | +$4,300 above avg. |
Estimates use 1.33% statewide effective rate. U.S. average uses 0.90%. Source: est., Tax Foundation / Census ACS.
The 2024-2025 HF 718 Overhaul
In 2023, the Iowa Legislature passed House File 718, representing one of the largest property tax overhauls in state history, taking effect over the 2024/2025 cycles:
- Levy Consolidation: It consolidated numerous separate, confusing city and county levies into a single “Adjusted City General Fund Levy” (ACGFL), aiming to force the general levy rate down to $8.10 by FY 2029.
- Revenue Curbs: It introduced tier-based limitations that prevent local governments from capturing massive “assessment windfalls.” If property values spike, cities must lower their levy rates to keep revenue growth constrained.
- New 65+ Exemption: It created a massive new exemption for homeowners aged 65+. For the 2024 assessment year (payable Fall 2025/Spring 2026), it directly reduces the taxable value of a senior’s home by $6,500.
Homestead and Military Exemptions
Iowa offers a suite of standard credits and exemptions to reduce the tax burden for primary homeowners and veterans:
- Homestead Tax Credit (Changing to Exemption): Historically, this was a credit based on the taxes levied on the first $4,850 of a home’s value. Note: Recent legislation will transform this into a direct exemption equal to 10% of taxable value (min $5,500, max $20,000) starting in assessment year 2026.
- Military Exemption: Reduces the taxable value of a home by $1,852 for most eligible veterans who served during active duty periods.
- Disabled Veteran Homestead Tax Credit: Provides a 100% property tax credit for veterans with a 100% permanent and total service-connected disability rating.
Estimated Tax Rates Across the Top 10 Counties
Polk County (Des Moines) and Linn County (Cedar Rapids) carry the highest property tax burdens in the state (over 1.50%). To fund the massive infrastructure, police, and school districts of Iowa’s largest metro areas, local consolidated levies remain high.
Dubuque and Story County maintain noticeably lower effective rates, hovering closer to 1.20%.
| County | Effective Rate | Annual Tax on $350k Home | Notes |
|---|---|---|---|
| Polk County | 1.51% | $5,285 | Includes Des Moines; highest property tax base in Iowa. |
| Linn County | 1.56% | $5,460 | Includes Cedar Rapids; highest effective rate in top 10. |
| Scott County | 1.33% | $4,655 | Includes Davenport (Quad Cities). |
| Johnson County | 1.50% | $5,250 | Includes Iowa City (Univ. of Iowa). |
| Black Hawk County | 1.36% | $4,760 | Includes Waterloo/Cedar Falls. |
| Dallas County | 1.32% | $4,620 | Rapidly growing Des Moines suburbs. |
| Woodbury County | 1.38% | $4,830 | Includes Sioux City. |
| Dubuque County | 1.15% | $4,025 | Lowest effective rate in the top 10. |
| Story County | 1.24% | $4,340 | Includes Ames (Iowa State Univ.). |
| Pottawattamie County | 1.38% | $4,830 | Includes Council Bluffs. |
Disclaimer and Methodology
This calculator provides estimates for planning purposes only, based on effective property tax rates (actual median taxes paid divided by median home values). In Iowa, residential property is subject to a state-mandated rollback ratio that taxes less than 47% of the home’s market value. This calculator uses historical “effective rates” to bypass the fractional math and provide a highly realistic estimate of actual homeowner burden.
What this calculator does not account for:
- Commercial or agricultural property, which are subject to entirely different rollback ratios and levy limitations under Iowa law.
- Future implementations of HF 718, which will shift the Homestead Credit to a 10% exemption model in 2026.
How to get an accurate estimate:
- Find your home’s 100% Assessed Value on your County Assessor’s property search tool.
- Multiply the Assessed Value by the state Rollback Ratio (e.g., 46.3428%) to find your Taxable Value.
- Subtract your $6,500 senior exemption (if applicable).
- Multiply the result by your local consolidated levy rate, and divide by 1,000.
Data sources: Statewide effective rate and aggregate county effective rates derived from the Tax Foundation, Census ACS, and SmartAsset aggregations. Statutory rules, rollback rates, and HF 718 mandates from the Iowa Department of Revenue.
Return to the National Property Tax Calculator to compare Iowa with other states.
